Manual updated to Bforartists 0.9.6

The manual is now also up to date. The changes for Bforartists 0.9.6 are added and the content is updated. New is the chapter 3.1.2 - 3D View by tools - Header.pdf. It explains all the menus and its tools from the header area. This means that the Bforartists manual for the 3D view editor is now complete. Remains the other editors